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Technique G144:Ensuring that the Web Page contains another CAPTCHA serving the same purpose using a different modality

About this Technique

This technique relates to 1.1.1: Non-text Content (Sufficient, together with G143: Providing a text alternative that describes the purpose of the CAPTCHA).

This technique applies to all technologies.

Description

The purpose of this technique is to reduce occasions in which a user with a disability cannot complete a CAPTCHA task. Because there are alternate CAPTCHA tasks that use different modalities, a user is more likely to be able to complete one of the tasks successfully.

Examples

  • A Web page that includes a CAPTCHA test that must be completed successfully before the user can advance to the next step in a process. The page includes both a visual task, such as typing words displayed in a image, and an audio task, such as typing letters spoken in an audio file. A user with hearing disabilities who cannot pass the audio CAPTCHA may be able to pass the visual CAPTCHA.
  • A blog comment form includes a visual CAPTCHA that must be completed before a user can submit comments. In addition to the visual CAPTCHA, it includes a CAPTCHA with a form field that asks, "What is two plus seven?" with a text entry field that allows users to enter the correct answer.

Tests

Procedure

For each CAPTCHA in a Web page

  1. Check that the Web page contains another CAPTCHA for the same purpose but using a different modality.

Expected Results

  • Check #1 is true.
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